Along with Kim Tae-jeong, Jeong Hong-gwon got put on hold until I was ready to do my Bruce Lee Update Project. In the early days I was questioning myself if he was in TOD as he wasn't credited and there were several names of people I couldn't identify. But after a while I became convinced I was right and wondered if the name Ha Yeong-jin was his real name, though even back then it seemed like a dodgy Korean name. But eventually it all fell into place when I looked over it again once I'd got a lot better it understanding Chinese names in Hangul, and could recognise all the missing names, including Ha Yeong-jin actually being Yuen Biao.
It's a shame that he doesn't get that many chances to show off his skills, as I managed to see a clip from Mission To Capture Mysterious Jewels where there are kicks galore, hopefully the full film will be available some day.
He was already credited (but not ID'd) on Deadly Shaolin Longfist, Invincible Obsessed Fighter and Magnificent Natural Fist. So I've added: his other film credits; his DOB; aliases; and added ID's for all his films except Story Of Murim Wicked Man, which there's still no footage available online. As usual I tagged him for Gaijin84's pics: Dragon Lee Fights Again and DSL.
Tower Of Death [1980]
https://hkmdb.com/db/movies/view.mhtml?id=6215&display_set=eng

Story Of Murim Wicked Man [1980]
https://hkmdb.com/db/movies/view.mhtml?id=19485&display_set=eng
Dragon Lee Fights Again [1981]
https://hkmdb.com/db/movies/view.mhtml?id=12097&display_set=eng

Jackie And Bruce To The Rescue [1981]
https://hkmdb.com/db/movies/view.mhtml?id=11645&display_set=eng

Deadly Shaolin Longfist [1982]
https://hkmdb.com/db/movies/view.mhtml?id=19173&display_set=eng

Invincible Obsessed Fighter [1982]
https://hkmdb.com/db/movies/view.mhtml?id=10341&display_set=eng

Magnificent Natural Fist [1982]
https://hkmdb.com/db/movies/view.mhtml?id=10057&display_set=eng

Cheers
Also: not related but, I added the Korean release date of 25Oct1986 for The Super Ninja and changed main date from 1984 as I couldn't find evidence of any release earlier than the Korean one.
https://hkmdb.com/db/movies/view.mhtml?id=9549&display_set=eng